For the test a transparent film and filter paper will be first be placed in the channel. Then, the sample fabric will be placed in a way that ensures that all surfaces are making contact and wrinkle-free. A beaker—which should be weighed beforehand—is placed at the end of the channel to gather the liquid the runs through the surface of the fabric.
The test liquid will be allowed to run and, 60 seconds later, the fabric will be removed and the filter paper, the beaker and the transparent film will be weighed once more. The difference in weight (before and after the trial) will be calculated. The values result in the Penetration Index and the Repellancy Index of each test tube and liquid given, in %.